Numerical simulation of pool boiling on smooth, vertically aligned tandem tubes

Abstract

Research highlights  3D numerical simulation of nucleate pool boiling in atmospheric pressure  Superior heat transfer capacity of water in contrast with ethanol and FC-72  Heat transfer coefficient decreases with increase of the tube inclination angle  Optimum inclination angle is found to be 30° for the specified operating conditions

Predicting of Pool Boiling Heat Transfer From a Horizontal Heated Tube Using Two Fluids Multiphase Model

“…The results of the pool-boiling curve and pool boiling heat transfer coefficient PBHTC of water for a range of heat fluxes 29 -87 ( / 2 ) are presented in Figure 3 and 4. The present simulation results were validated with the experimental work of [29] and numerical work of [1], and the results of pool boiling curve and heat transfer coefficient are in good agreement with this experimental study, and this is because we used same geometry and boundary condition of [29]. The total heat flux was found to be close to experimental heat flux after taking in our consideration the uncertainties of the mentioned experimental work.…”

“…Two sets of conservation equations which govern the balance of mass, momentum, and energy of each phase are presented as follows [1,17]:…”

“…Boiling heat transfer is a significant heat transfer mode for industrial heat exchange systems due to the ability to remove a large quantity of heat in small superheat temperature. Boiling process and two-phase flow involved in many applications such as boiler tubes, evaporators, nuclear reactors, tubes bank or tubes bundles in heat exchangers [1][2][3][4][5]. To thoroughly understand the design of the heat exchange system, there is a necessity for understanding the critical factors of this phenomenon.…”

Comparison between modelled and measured heat transfer rates during the departure of a steam bubble from a solid surface

“…[8,9], where it was suggested that significant flow of heat is caused by the gradual, albeit quick, rewetting of the 'dry' portion of solid surface beneath a departing bubble. A better understanding of these processes is crucial for the development of computational models of boiling flows, and in particular of macroscopic two-fluid CFD techniques, which require closure relations for sub-grid scale models of wall-boiling heat transfer, and are used in a broad range of pool [10] and forced flow [11] [12] boiling calculations.…”